<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body style="padding: auto 0;">
  <center>
    <div style="width: 20px;height: 20px;background-color: red;"></div>
  </center>

</body>

</html>